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VulnerabilityPublished

CVE-2026-99247: Linux kernel · tracing: Do not initialize tracefs work if tracing is disabled

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e8665e884e076d894f3eed8b9ea28e37a6448604 : patch Linux kernel soon.

Data as of 3 Nov 2026, 11:43 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in e8665e884e076d894f3eed8b9ea28e37a6448604, e8cfcd7e60eaa3b0dea4d71c64499604e7081736, b3b974008388ab59e44d764ba7a63c988fec2524 +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 3 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 6621a7004684bfcff5af4c8e4d37989941f42a6b, < e8665e884e076d894f3eed8b9ea28e37a6448604
Fixed in
  • e8665e884e076d894f3eed8b9ea28e37a6448604
LinuxLinuxAffected
  • ≥ 6621a7004684bfcff5af4c8e4d37989941f42a6b, < e8cfcd7e60eaa3b0dea4d71c64499604e7081736
Fixed in
  • e8cfcd7e60eaa3b0dea4d71c64499604e7081736
LinuxLinuxAffected
  • ≥ 6621a7004684bfcff5af4c8e4d37989941f42a6b, < b3b974008388ab59e44d764ba7a63c988fec2524
Fixed in
  • b3b974008388ab59e44d764ba7a63c988fec2524
LinuxLinuxAffected
  • ≥ 6621a7004684bfcff5af4c8e4d37989941f42a6b, < afd38b10b1c6a5c5d6952b15b990596dab9684e6
Fixed in
  • afd38b10b1c6a5c5d6952b15b990596dab9684e6
LinuxLinuxAffected
  • ≥ 6621a7004684bfcff5af4c8e4d37989941f42a6b, < 7539c61f522ff693d9565a0411386c2236e776cd
Fixed in
  • 7539c61f522ff693d9565a0411386c2236e776cd
LinuxLinuxAffected
  • ≥ 6621a7004684bfcff5af4c8e4d37989941f42a6b, < 813e18881c6472eb229a63180ff42c808e3e949b
Fixed in
  • 813e18881c6472eb229a63180ff42c808e3e949b

AI-suggested

A fix is available in the Linux kernel commits identified by the fixedVersions hashes. Systems running the affected version (=5.19) should apply these patches to prevent the kernel NULL pointer dereference during boot. No additional mitigation is indicated.

Description

A vulnerability in the Linux kernel tracing subsystem can cause a kernel NULL pointer dereference during early boot if tracing is disabled and trace buffer allocation fails. This occurs because the tracing initialization work is queued without checking if tracing was disabled, leading to a crash. The issue is fixed by adding a check to avoid initializing tracefs work when tracing is disabled.

References

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